Material Balance LAMBDAs
Havlena-Odeh straight lines, p/z gas depletion and water influx from aquifer models.
29 lambdas
PO.MBE.Gas.Pz.SI(P, z)
Calculates p/z ratio for gas material balance analysis, [kPa] (SI units).
PO.MBE.Gas.ModPz.SI(P, z, Pi, ce)
Calculates modified p/z for geopressured reservoirs, [kPa]. Accounts for formation/water compressibility (SI units).
PO.MBE.Gas.OGIP.SI(P, z, Pi, zi, Gp)
Estimates OGIP using standard p/z method, [sm3]. Assumes volumetric depletion (SI units).
PO.MBE.Gas.ModOGIP.SI(P, z, Pi, zi, Gp, ce)
Estimates OGIP using modified p/z for geopressured reservoirs, [sm3] (SI units).
PO.MBE.Gas.PredP.SI(G, Gp, Pi, zi, z)
Predicts reservoir pressure at given cumulative production, [kPa] (SI units).
PO.MBE.Gas.PredGp.SI(G, P, z, Pi, zi)
Predicts cumulative production at given reservoir pressure, [sm3] (SI units).
PO.MBE.Gas.URF.SI(Pi, zi, pa, za)
Calculates ultimate recovery factor based on abandonment pressure, [fraction 0-1] (SI units).
PO.MBE.Exp.Eo.SI(Bo, Boi, Rs, Rsi, Bg)
Calculates oil and dissolved gas expansion term (Eo), [rm3/sm3]. Eo = (Bo-Boi) + (Rsi-Rs)*Bg (SI units).
PO.MBE.Exp.Efw.SI(Boi, cw, cf, Swc, m, deltaP)
Calculates formation/water expansion term (Efw), [rm3/sm3]. Accounts for rock compaction and connate water expansion (SI units).
PO.MBE.Exp.Bt.SI(Bo, Rs, Rsi, Bg)
Calculates two-phase formation volume factor (Bt), [rm3/sm3]. Bt = Bo + (Rsi-Rs)*Bg (SI units).
PO.MBE.F.Oil.SI(Np, Bo, Rp, Rs, Bg, Wp, Bw)
Calculates underground withdrawal for oil reservoir, [m3]. F = Np*(Bo + (Rp-Rs)*Bg) + Wp*Bw (SI units).
PO.MBE.Ce.UnSat.Oil.SI(co, cw, cf, Swc)
Calculates effective compressibility for undersaturated oil reservoir, [1/kPa] (SI units).
PO.MBE.Ce.Gas.SI(cw, cf, Sw)
Calculates effective compressibility for gas reservoir, [1/kPa] (SI units).
PO.MBE.Ce.Geopressured.SI(cw, cf, Sw, Rsw, Bg)
Calculates effective compressibility for geopressured reservoir with gas solubility, [1/kPa] (SI units).
PO.MBE.Ce.PoreVol.SI(cw, cf, Swc)
Calculates pore volume compressibility term, [1/kPa]. cpv = (cw*Swc + cf) / (1 - Swc) (SI units).
PO.MBE.Ce.Total.SI(cg, cw, cf, Sg, Sw)
Calculates total system compressibility, [1/kPa]. ct = Sg*cg + Sw*cw + cf (SI units).
PO.MBE.Aq.Pot.Vol.SI(porosity, h, ra, rr, theta)
Calculates aquifer pore volume for pot aquifer model, [m3] (SI units).
PO.MBE.Aq.Pot.We.SI(ct, Wi, deltaP)
Calculates instantaneous water influx for pot aquifer, [m3]. We = ct * Wi * deltaP (SI units).
PO.MBE.Aq.Sch.Rate.SI(C, Pi, P)
Calculates instantaneous water influx rate (Schilthuis), [m3/d]. qw = C * (pi - p) (SI units).
PO.MBE.Aq.Sch.We.SI(C, Pi, pressures, times)
Calculates cumulative water influx (Schilthuis) using trapezoidal integration, [m3]. We = C x integral(pi - p)dt (SI units).
PO.MBE.Aq.Fet.Wei.SI(ct, Wi, Pi)
Calculates maximum encroachable water (Fetkovich), [m3]. Wei = ct * Wi * pi (SI units).
PO.MBE.Aq.Fet.J.SI(K, h, Uw, ra, rr, theta)
Calculates aquifer productivity index for radial flow (Fetkovich), [m3/d/kPa] (SI units).
PO.MBE.Aq.Fet.JLin.SI(K, h, Uw, w, L)
Calculates aquifer productivity index for linear flow (Fetkovich), [m3/d/kPa] (SI units).
PO.MBE.Aq.Fet.Pa.SI(Pi, We, Wei)
Calculates average aquifer pressure (Fetkovich), [kPa]. pa = pi * (1 - We/Wei) (SI units).
PO.MBE.Aq.Fet.Rate.SI(J, pa, pr)
Calculates water influx rate (Fetkovich), [m3/d]. qw = J * (pa - pr) (SI units).
PO.MBE.Aq.Fet.Wi.SI(porosity, h, ra, rr, theta)
Calculates initial water volume in aquifer (radial), [m3] (SI units).
PO.MBE.Aq.VEH.tD.SI(K, t, porosity, Uw, ct, rr)
Calculates dimensionless time for VEH aquifer, [dimensionless]. tD = 0.00634*k*t / (phi*muw*ct*rr^2) (SI units).
PO.MBE.Aq.VEH.reD.SI(ra, rr)
Calculates dimensionless radius for VEH aquifer, [dimensionless]. reD = ra / rr (SI units).
PO.MBE.Aq.VEH.U.SI(porosity, ct, h, rr, theta)
Calculates aquifer constant for VEH model, [m3/kPa]. U = 1.119 * phi * ct * h * rr^2 * (theta/360) (SI units).